I'm looking for the same. I have 2 Haunter, a Kadabra, a Machoke, and a Graveler I want to trade and trade back. Have Eevee version if you need exclusives.
Some words of advice: Make sure you trade with someone you trust. Especially, if youre trading a high lvl Pokmon. The person may not trade it back if youre just wanting to evolve it and not do a permanent trade.